Management and Technical methods of coriander after the Beginning of Autumn

After the beginning of autumn, open-field coriander planting enters the peak season. Coriander: The current management focuses on "three defenses" to prevent bolting. Although coriander planted in the open field in summer and autumn will not bolt due to low temperature at seedling stage, it will bolt due to long sunshine (conditions) in summer and autumn, which requires the selection of bolting-resistant coriander varieties in production. In addition, strengthen fertilizer and water management (coriander whole growth period should be watered small water spray vegetable strong stem spirit 5~7 times, first three water, every 10 days or so watering spray vegetable strong stem spirit once, from the fourth water every 6~7 days watering spray vegetable strong stem spirit once. When watering the head, lightly apply fertilizer to the seedlings, apply urea about 10 kg per mu, and then apply urea once every 2~3 times, 10~12.5 kg per mu), spray 800 times of new lipid membrane once, can reduce bolting. Prevention of "red stem" coriander "red stem", that is, the stem and leaf part of coriander from green to red, reduces the commodity value of coriander, the purchase price halved. The stems and leaves of coriander grown in the open field in summer and autumn will turn red under strong light, especially when the seedlings are too late (plant height exceeds 8 cm). In order to prevent the emergence of "red culms" of coriander, one is to spray a new lipid membrane on seedlings in the morning. In production, it is advisable to thin seedlings to 3 cm high, and keep the plant spacing after thinning at about 2 cm; The second is to cover the sunshade net. Farmers with conditions can set up a scaffold 80~100 cm high after sowing, and cover a layer of sunshade net on the shed. Rain-proof summer and autumn season, rain more, just after the emergence of coriander seedlings soon after the great harm. After heavy rain, it suddenly turns fine again, which can easily lead to rotten coriander heart. After the rain, then lightly water well water again, the amount to not submerge seedlings is appropriate, spray a new lipid membrane once, can prevent coriander rotten heart. During this three-prevention period, the timely use of vegetable strong stem spirit and new lipid membrane can make plant stems thick, leaves plump, leaves fresh, plants lush, natural taste thick. At the same time, it can improve disaster resistance, reduce pesticide and fertilizer consumption, and reduce residual toxicity.